Satellite Antenna
To ensure optimum reception, do not place items on the roof around the rooftop antenna location. Metal objects placed within the line of sight of the antenna will cause decreased performance. Larger luggage items such as bikes should be placed as far rearward as possible, within the loading design of the rack. Do not place items directly on or above the antenna.
See also:
Sunroof Maintenance
Use only a non-abrasive cleaner and a soft cloth to clean
the glass panel. ...
Economy
Improper inflation pressures can cause uneven wear patterns to develop across
the tire tread. These abnormal wear patterns will reduce tread life resulting in
a need for earlier tire replacement. ...